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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb74660e76c5c770915055eda01a387e8a24427bc21cbc9b94f0d49ebdf0473' 
  AND token = 'M9/18xc9wDCLYqaH+fpec/hQbqgoYzJ465rYWKzye70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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