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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0802efefed066fbb94b782d196897be183ba5a0e7d5b64ded7fb62bbb518b6ac' 
  AND token = 'tydiuL67RnsosadclEL3Zp39xpILWJK38W41AKud6L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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