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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa4f895ca8c8da93c5da2e523af82f89c95c2ffa318240033770257c80dc015' 
  AND token = '1zTJwetXv/Nv2rJdqPXuP/K3JOjtjNINstaddqxNFYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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