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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7656a874f9231f16f73d2612a4f53ec18317311cf5c14def5e04e4307343999' 
  AND token = 'eHOAVNEtvRW3Br1614HCpihuP8Gm92yQejQja3FMg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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