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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735bff4aa2d6f70788dae5153b0445c91d82c418ceb51fcab92ee09ac8159d11' 
  AND token = '4zGy4tbazfZfldXiJueK3Zd6CcK09wQDibBYE8f8qcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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