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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c77f0489d1176e30aa942d7154c3e14ff46fc30278c3f8a2283eb76f0bba3f' 
  AND token = 'Tv70m5LK1T6flzwNs/gAZPYvX4MArQezrYz4ahpIm5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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