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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '251fb4d2c9da77ee95a6cff6897d097032b60aed6bf096e97ba6b90554a98e5e' 
  AND token = 'pnCaYqF+W8PHb5TEbXv2DTR4qrBgjia8PWnYyMek0k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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