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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a0d3cc521af95501be7a225d5520b007711886feb83acad95f8eefff4d72d31' 
  AND token = 'ALhpBkenjOwoq44yvpD6pP+9Tx5xTPdk60/d5wsjeb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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