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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d916082d56409375baa4ae17dcf0ff07d74186deff9d596bfd59a85d0e318a0' 
  AND token = 'A6li6AR8+t47QjpWNOi7Ju5L1GWclT3jo63a1XNlPFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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