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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84858f2f30d13352779e38c70df42b2f8d05a9fa2596fe22a2b98a18da4e1d43' 
  AND token = 'KBtD6Q6ty3kShSp6BpR9xwQUueIpHdlPJIgnDmrU7m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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