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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e48ba92a54295849fb25d3ea2ed438e43da75323d2eae2113856902e8a89934' 
  AND token = 'wmOHmFHFqwg2oOUAScTbAjDgoDndC3iylNmcmp/Qir4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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