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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e60d5d6b0ead910a84116e37b7e73eeba34db6f71c442dd9db6b2d3b7a0013b' 
  AND token = 'R6xgRibYepqAx85sB7YabXr7ertUDyK2YdV3xe5ipes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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