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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede9638296a807cc2bac84674657d1f3c87d8450b8e5f4f14a3f4ce144a01014' 
  AND token = 'rqwI+h13R+Y2pFOs43WVxVhuNup+u2vx9loPySN4Dz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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