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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bc8aaadafad40721c36981b335a6a55cb941ae409699a93efca4eb48a497e6' 
  AND token = 'Kk5epWYTqcSHh6ubL9lErhPkAoK88T7vkUzgIlxpv6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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