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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bed949923433c2c8c6c498620e17a8f1ad9ce6b3befced5e5e4ec34d08954e' 
  AND token = 'pMANhMyNWeq8nGpQd8zdaotkcQalcgA7rRs2TKQNSD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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