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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41331c4edd05facaec60964ec3eded1c660c5114c0d27474b08e582b073b7529' 
  AND token = 'UhVbN/gxpOkaF2876QlvgFqQ/z/Jww3+Lit1n4mSdBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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