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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5b92293919ab340bed570dbc8e4328e941de8032a2cafc74bc47602b35bc48' 
  AND token = 'rfyb3b9PYca+21+QIFz76p7umzT28oAxabSM+W+iP68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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