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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ca23bf44291dd7f6d905104a64d08c54cf901e9d0b554489a9d6680ac2c30c' 
  AND token = 'srOkyMeB2w0tBJC2HGrope+n428n3lTrCUepd9tsWXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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