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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8391585430ffffce5fa88ef6dd5f73ba69a172e101c1424faab81fa0de6912' 
  AND token = 'GQC8Kn782n1neXGZ4t3b3Iykw7OUSpUS4xxKTre+BOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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