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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc44a1119f9522fad59d112cbe065975b489fa9de9827308975720739e9299ea' 
  AND token = 'MCkjy7Y8MYT2E50NrPBS3/u0uEhkPkeneamKWcfRhrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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