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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d29ccd5fb3483ce04a99f210be52d0ee8fc1deea40cd88bcaaa88e31c83ab59' 
  AND token = '8TwaII6Y0BjXpL/HCnGoE2kxdIRwAJGbM3j1nxcsLO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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