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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac819741f9e5a7db5c1fe52ff7f16cea2746a2525e2c671d4869a0f03aff82ab' 
  AND token = 'WskHcarWpcnyZkPmjdMDLAkSU5J6Va//vaPrasgxkes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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