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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79809a65d8eba86d74cf3e356e6c647bf6e0b48c1b8a3c178aac108ca5fd650' 
  AND token = 'r9khRkbgLkX1wWbQx8r843rZtX9dwoOMhxuSuuUhQs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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