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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c262cf1ab7ed1bdb45c7605adf088d3358f7ca96a7793aabeb5804532b89fdec' 
  AND token = 'n4WcWUKWZUSx/+km5500yG/xka3F+LnQq8dFTWH/DWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}