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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0470bc9d665e8eb47d32264be98f4c82dfec803b762c99b135a3c2df3a7b59bf' 
  AND token = 'NDj+J7NM+EB4T5YWJK9aIZDqTCrkqsdrdlA/R+LpqEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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