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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75ddd79eb4f0f44a8bb922ed235628697c83955ec25cb92adbf9ea312ba7c3c' 
  AND token = 'vfN/oJQf2FRtertGBgOfNkkqrJW804xRTFfVuD39QkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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