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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e735d10fcc488440b3391d5b4cf2df8232025670538b803b14d65fb052c5281' 
  AND token = 'dKPoJC5SVK6J+s31k9C35xf2mn6Y+p+pIgFq/PKY04E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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