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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfaa0479060cc247f3d93d7d1e5a4f4a6391571f4dedb2f2b4c2b6232a32bba6' 
  AND token = 't3FAZ2zuCUZ5rnWPh3XD0wPiYSWGQKmdhqB7Fe4F0cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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