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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '558827706c9f45897c6218b146f7b432ecc83a779090d30e4c300543c6d11165' 
  AND token = 'WZLVEBqOYCxbcxTB5qwB4RlmXU+wc01T76Y6d8ROL+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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