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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e51c9515790397d3e1b55246aee96fe97949b1cd26ea709c6f3f9c61366672' 
  AND token = 'RSqQ+SsHMO3TBKubNOtrDaUnGY3tl96gCYq2ewC/Dbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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