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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7350f379f60e58817399e8db2bb3603d704c600018c3064c8ce3dae1a303d2e' 
  AND token = 'oQdi2xnwUrIuvIXa0RriRuBOpZPNigY1spy7vPqwdFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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