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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5d8e4463c84b56280a7dab76e9caaaf8d48b9f471a86bbfdef11416480e81a' 
  AND token = '5IJdzgYn00dRu0dClAIKiNopF8NhzR6c11/V3aAx4Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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