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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a4e0cfa6c9eac1f8b53a3072cfac0b3fee5127e39a4b733a02965d45c622bd' 
  AND token = '8eR1h84/q9MR3LoBmc3AEXUlU8V40zo3gUmuz6V6SfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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