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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83fb14d59b936d15f6e4e8fce396d1a7ccbe9840e2470788ec3ef454820715d' 
  AND token = 'cgFcBWU0mbGU3QUJS8RFtETpyjIJjgiV1Xc83uwJzpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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