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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd578a34ce3a06105fccec0368a4c2b1dde3cfce4947e6d14e9f968c9407ccd9' 
  AND token = 'KyeRbHelqoaPW6Ecr4O8xIwWoo9c4z0GspDqSjC8XsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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