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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e756db9ddb8411c96926337f85a36e211cbdc69b918f47217607043482cade' 
  AND token = 'YJw+6HWGrA3/RPgaXtYVGIcns0yVbiqkwq0bDi1l0I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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