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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa85729c169acc9714e401663d63ab60fe916c10a23b71b4c503bea131d8e96b' 
  AND token = 'nW9FX78PrgxNbISZzp42xrS8NytK/cJ4uE+ccYr6HqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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