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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e3a37df25434fc9dc6dfc69826b9e7a72e4ed36d50791fc3e59c33198666ef' 
  AND token = 'eKnmvLbPm8knjuWUIwaN3yGdS7VPhfO1BXZhwtmMuc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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