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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfb3f8f3a5ec1c25743ad3747f16bfe999a7faa1f798b607dbc615716832cb1' 
  AND token = 'is26I3fEuWsum0SLJmqQsSYInlGf4TduGxCAML5PTNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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