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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ef16eea8aca219909f2aa3be0322809c896a726cefb78a270c41cf643900fd' 
  AND token = '99Bgs2PFIqHiVvTSoH6obbIC8CwHllfF3Dv8ilS9Bjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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