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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da6f16e7ac24e7285df3eed98a9b2f68f3f61bab67640fec504bf895b91c0f5' 
  AND token = 'q2Hk3j3AA81OrcxXsCMC0325sK/Uydm3n4ou/3rJWHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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