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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '100c068845d4d6de342620c7394edb563fc2af09b8b1b3661cfe012c344e87bc' 
  AND token = 'q3Xr3D826fFtv7z9aPzPuqCUuSCYq4gKbXm542QF3tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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