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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c031d6ffb62bae2a751024cec37904aec85da5602d71a2cf97a05867ca13e7' 
  AND token = '6nep/MEVCxT1Pcklsgc2FXQDVgbNjfugZUkXBX1KQbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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