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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1f1582b8edcc9df9ddc9a40f587803daa08173502cf2fbb16f7d5ed2784d6e' 
  AND token = 'zH4iVI1pwdM9B0kLVfNKzETxJhnCtbppZ0cPKFYsmLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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