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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cdd205a02d6ab5394b7844b2441a0df0413f15feb93c61c7380d61b630530b3' 
  AND token = '4OU7qpFU7aRSfaIDDiWSaH79ljGD0/OKIO79OAC0GtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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