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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb3b4a0b01457a8b8ec14a4a9cb5f5bc7f62c52ba383bec6d1f2b22a272a8d9' 
  AND token = 'HGszDA4z1eFqzCr/TKWcy/Usk6mbcdR/xHtoZ2wu5OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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