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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c07c206e974feda1f6cbd79544e7af0894cfec19e1566fda1eeab8f1f11ecb2' 
  AND token = 'aYbaJ5mRNn1OM3PzKyte3FzfJ1RmAUjVyEVHuaPqJno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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