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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd13b549204703b37965a0e886ffea4d52f4232fe548c5f62027e7b85a50f796d' 
  AND token = '3Kf+xBp2KnPgNSrP8hDL3LqmF1zP0NrWarAA7cp3zaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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