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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c057af89ff8718e0323c7818650812751ed1e7f9c94177a5b768f5e8a804f7be' 
  AND token = 'IJt5GugnuGUnKakBVLP+WTNq1Hhb6tPfz3E+ngPfBS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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